There are some transistors up for sale right now on Ebay that have a package I haven't seen before. A cross between a TO-1 and TO-5. This one is billed as an OC71N...but I can't tell the manufacturer. Is anybody familiar with this?
(https://i.postimg.cc/S20VcBcB/Screenshot-2022-01-22-at-09-32-16-OC71-N-PNP-Germanium-Transistor-N-O-S-Tested-e-Bay.png) (https://postimg.cc/S20VcBcB)
SFT?
I always thought the SFT packages were a bit more elongated. This looks a touch more like a TI 2G3xx series. In any case it looks like the "OC71N" is a post-production restamp, but I may well be wrong about that.
Genuine OC71s (Mullard/Philips) were always in a black glass package. This one appears to be a remarked something. Looks like an AC128 package. Telefunken?
In the pic here you can see a large logo on one side. I can't quite make it out.
https://www.radiomuseum.org/tubes/tube_oc71.html
[Actually it says manufacturer SI under the pic]
I don't think "TO1" was ever a formal standard. It was retro-fitted to several existing similar commercial packages after JEDEC got their transistor staff organized. "TO-1" may be flat or dome on top, straight or flanged on bottom. It is probably the product of a button-shank machine, adapted as each maker saw fit.
it looks as tho the case has an emitter tag, in which case it would appears to be over the collector pin. I've only ever seen germs pin-marked on the collector, I think.