All tubes from the same batch in the April 1990 issue with a seal I selected 6 pieces of the same height and tested. 4-point IGD2-R, released in the USSR in 1988.
The item "6x IN-18 MATCHED SET IN18 Nixie tube tested NEW + 4 dot" is in sale since Monday, December 28, 2020. This item is in the category "Consumer Electronics\Vintage Electronics\Vintage Audio & Video\Vintage Parts & Accessories\Vintage Tubes & Tube Sockets". The seller is "sdnf2346" and is located in syberia. This item can be shipped worldwide.