As I understand, the Selectric I and II (and Personal Selectric, which is AFAIK an 11", single pitch Correcting Selectric II that uses Selectric III ribbons) are the more reliable machines, although nowadays, condition probably matters more. (What I've read is that the Selectric III having 96 characters means that the print mechanism's tolerances are a lot tighter.)
Also, if you go Selectric I/II, you really want a dual pitch Correcting Selectric II (that's the most common config, though). Dual pitch means you can use
all of the type balls. Good luck finding an 11" in that configuration (I'm not even sure it actually existed, but the Personal Selectric in 11" correcting in single-pitch did), though, most of them I've seen have been 13" or 15", mine included. (How you can tell how big a Selectric is in a photo: 11", the part of the cover opening closest to the keyboard is narrower than the keyboard; 13", it's about the same width; 15", it's wider.) My holy grail is still a 12 pitch (smaller font) correspondence coded (using office typeballs) Selectric 731 (73x = Selectric I I/O (although it looks like a II), xx1 = 11").
Another thing to watch for with Selectrics is the ribbon types:
- 71x (original Selectric I) uses an old-school spooled ribbon (usually in carbon film). You can still get these.
- 72x (another Sel I configuration you could order) uses fabric ribbon cartridges. I want to say that these are the hardest to get, but you can still get them. Print quality is also worse with fabric ribbons.
- 84x/88x Selectric IIs used the same fabric ribbon as the 72x
- 83x/87x Selectric IIs and 85x/89x Correcting Selectric IIs (except for the 851 Personal Selectric, see Selectric III for that) used Selective Ribbon System, and you want Selective Ribbon System, you can still buy SRS ribbons in any office store today even
- There was a 96-character Selectric Typewriter in the 9xx line, 94x/92x use the 72x fabric ribbon, 96x/91x and 95x/99x (Correcting) use SRS I believe - I think this was an exceedingly rare Selectric III in the Selectric II style, basically, and now I know what a picture I saw was. I'm going to go ahead and say that you're not going to find one in the US, and it was probably made for a very short time to provide a solution for international characters before the Selectric III was ready.
- The Selectric III could come in the 72x's fabric ribbon system (6701), the Selectric II's Selective Ribbon System (but I think that's exceedingly rare), or its own Cartridge Ribbon system. I believe production date determines that, not model number (except for the fabric ribbon system, which had its own model number). The Personal Selectric 851 used Cartridge Ribbon system.
You may note that I'm leaving a few models off that list - things like the 73x, all the terminals based on the 73x, the Mag Tape and Mag Card machines, the Composers, the Memory Machines, the Electronic Typewriters, etc., etc. - and I've done that for two reasons. #1, they used ribbons from all over the place, and #2, you really don't want anything based on an I/O mechanism unless you really,
really know what you're doing (and they're typically exceedingly rare anyway). And the Electronic Typewriters have a reputation for being incredibly unreliable, and are probably the reason why the Wheelwriter exists (IBM tried to adapt the Selectric design to do what the cheap Japanese daisywheel machines were doing, first with the Memory machines (which were just a computer strapped to a Selectric I/O mech), and then divorcing the keyboard from the printer with the Electronic Typewriters. It didn't work well at all.)
Mine, while we're at it:
![2012-12-06_06-12-10_889.jpg](./download/file.php?id=60878&sid=beddd16b27b4c4ff3cd32dba97ad2b0a)
- 2012-12-06_06-12-10_889.jpg (442.42 KiB) Viewed 23679 times
(It was originally beige, but when I sent it to
this guy for an overhaul, he included painting for free, so I figured I might as well.)
If you want to go daisywheel, I'd say to at least go for something with good switches. Brother loves their rubber domes. AFAIK, everything daisywheel that IBM/Lexmark made was membrane buckling spring (and based on release dates, the original Model Ms were likely the original Wheelwriter 3, Wheelwriter 5, and Quietwriter 7 (Quietwriters were, IIRC, thermal transfer printers instead of daisywheel), several months before the first known standalone Model Ms). That means Wheelwriter and Actionwriter (the Actionwriter began as a TA Adler-Royal machine, but IBM customized it to an extreme extent). There's plenty of other mechanical (albeit typically linear) switches found in other manufacturers' typewriters, though.
As an aside, know how the Model M2 was sold as the "Selectric Touch Keyboard", and how we all think that's bullshit, it must have been some marketer that had never actually used a Selectric that came up with that? Well, IBM was trying to ride the Selectric name with the Series I Wheelwriters and Quietwriters, and sold them as "SELECTRIC System/2000". So, there were Selectrics that felt like membrane buckling spring keyboards, because they were membrane buckling spring keyboards!
Edited to replace image with attached copy instead of one hotlinked from Google, and to fix a typo.