Interesting. It's kind of a early/mid 30s style playfield. The flippers look too "mature", though, and notice the placement of the right flipper button is forward due to the ball lifter. That implies retrofit. Not sure what that plunger looking thing on the left is for.

The name of the game is also interesting: "Atomic Gun". The word "atomic" wasn't in popular usage until after the war and the start of the "atomic age", at least in the US.

The row of lights on the right also look rather modern, but the game clearly was designed with them in mind.

The cabinet is also weird with the grey square pattern and public park bench styling.

My guess is this is just one of those wacky frankenpins from spain, which borrows elements from several previous eras. That, or it was made in the 30s and stuff was added later to keep it earning.

I did a quick search on the spanish patent search site but it didn't find anything. Quite possible they've reworked their ID or numbering scheme at some point. Mystery pin!

Another thing I just noticed is the placement of the flippers in the same style Steve Kordek put them when they first went to the bottom of the playfield. That was around late 1947.

Like Michael J Fox in Back to the Future.

Humpty Dumpty is the first game with electro-mechanical flippers. There's a game that came out 15 years prior which uses mechanical flippers called Double Shuffle.

http://www.ipdb.org/showpic.pl?id=723&picno=24723