Can anyone identify this gear shifter type?

[whiteout75]

Hello,

New to the forum and my partner has recently acquired a tandem bike i would say of 60's/70's vintage, but the gear shifter requires replacing.

Would anyone know what type this is and where i might be best placed to start looking to find one to buy online?

Many thanks in advance!

 

[Cycleops]

Hello and to the forum.

It’s a basic friction (no indexing) shifter. No branding evident.If you want to replace it new here’s a Sunrace one on Amazon.
Amazon product ASIN B007QMJH86View: https://www.amazon.com/Sunrace-SLM10-Friction-Shifter-Set/dp/B007QMJH86/ref=sr_1_4?dchild=1&keywords=Mountain+Bike+Thumb+Shifters&qid=1615563231&sr=8-4

If you want something more period correct I’m sure you could find some on eBay.
This one is indexed and a bit later but I’m sure you could find a seventies one:
https://www.ebay.co.uk/itm/VINTAGE-...-/254796230151?_trksid=p2349624.m46890.l49292

 

[weareHKR]

Give it a good blasting out first with some WD40, find a place to get the straw in & work the shifter at the same time.... might just bring it back to life, back to reality...
If it works blow some GT 85 in it.... often!

 

[Cycleops]

Give it a good blasting out first with some WD40, find a place to get the straw in & work the shifter at the same time.... might just bring it back to life, back to reality...
If it works blow some GT 85 in it.... often!

A quick blow often gets other old dormant things working again

 

[digital domestique]

The advice to repair is good, saves money and it's pretty damn easy to do!
Failing that, tho, I frequently (too frequently) frequent a bicycle breaker shop where they recycle old bicycles. Many good things have been found there. Unfortunately. (a perfect 80s Cilo frame. a complete 70s Raleigh International.)