FS Collets- unknown small

[AR1911]

I bought these a while back thinking they would fit my lathe, but they do not.
In fact, I can't identify them on any of the charts I've found.
Any help with ID would be appreciated.

So, available for best reasonable offer, cash or trade. Shipping $5.00 CONUS

 

[Metal Butcher]

My guess would be MT-3.

I don't have any to measure up, all mine are MT-2.

-MB

 

[AR1911]

Definitely not MT3.
I have a chart that lists every collet in common - and uncommon - use.
Nothing matches these dimensions.

 

[ozzie46]

They seem to resemble R-8 tooling.

Ron

 

[AR1911]

Sort of a half-size R8, with a shallower taper
If I had a r8 handy i'd post a comparison pic.