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Just won this on ebay for just over a tenner (GBP) incl postage.
It's a bag of "about 40" SRB spur gears and final drive gears.
Hopefully worth at least

try carbon dating the material

What do they taste like? Old or new?
I wonder how so many found their way into one place like that? - have you checked for Tamiya markings? Just wondering if someone had been machining a pile of them to sell at some point & was kerthunked by the re-release of the SRB chassis

They've arrived. Consists of 7 packets with a 65T and 70T spur gear in each one. These packets are marked "SPN16" on handwritten stickers (see photo), which is the part number of the spur gears for the SRB.
Also 9 more 65T gears and 18 SRB final drive gears (with hex in the centre).
There are no Tamiya markings, but I am not sure if the originals had them - can someone tell me? (Maybe someone could look at a SRB spur gear for me).
The spur gears are marked 65T or 70T on both sides.
It looks to me someone had a bunch of gears and has collected them into pairs for sale.

I'm pretty sure these are originals, by looking at the pictures. The originals did not have any Tamiya markings, only the tooth count on the spur gears.
Nice find!