I recognise them as Tamiya poses, but the assortment (only five figures; no prone MG) is wrong, nor does the base
spring-out as instantly recognisable, so I suspect copies, and 1:35th? So possibly not Bandai's 1:48th (they had little square bases I think), but maybe Aoshima? Nitto cloned them in 1:76th, quite crudely.
The only clue is No.58 1972
[and a] 1 [and] 2 (part sets?) and the star down the bottom of the sheet; which could be Tamiya's, or an asterisk! The reverse is
blank, but that may only be because it's a photo-copy.