Nice little pocket guns.
I've had a couple in .22short and they worked beautifully.
The Astra Model# for these is Model 2000.
It replaced the earlier Astra vest pocket 25cal,,the Model 200.
From Antharis's Astra book, :
.22short cal Model 2000/Cub production ser#'s
1966 thru 1968 (Eight) ...150.001 to 175,000
Sounds like a rounded off number, but that's what he published.
The Spanish Proof Date Code along with the Semiauto Proof marks are likely underneath the Left Hand grip panel on this one.
That will tell you the Yr/proof, which is also taken as the Yr/Mfgr.
Early Cubs had those Proof Marks on the frame visible w/o taking the grips off.
Early production pistols had both the Model 2000 designation & the 'Cub' name cast into the grip panels. Grips were black plastic.
Starting sometime iin the mid 60's +/-, the grips changed to brown plastic and the Model 2000 designation was dropped from the grip panels. Just the CUB name remained as on the OP's pistol.
FWIW, Sometime in 1972,,Astra changed the Hammer on the Cub from a forged steel piece to.... (OMG!) a Sintered Metal production mfgr part.
I've not heard if any other components were also then made from the Sintered process. A guess is that the trigger also fell to that technology of easier & less expensive mfg'r as well., but just a guess.