Update: sample to test this and other tubes:

https://www.ebay.com/itm/314669486662

LND 712 Geiger-Muller tube

made in USA

In set:

 1x LND-712 end window-alpha-beta-gamma detector

(solder to clip first, then mount to tube anode, do NOT solder directly to anode - risk of internal damage)

Used, tested, fully working and in spec.

datasheet:

https://www.lndinc.com/products/geiger-mueller-tubes/712/

Shipped in safe package, with tracking number, from EU.