Crosman 1020 air pistol

Can anyone provide any info on this pistol such as date of manafacture 
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It's not a Crosman. Marksman. Cheap funky and they made a million of them. Zillion? A lot of kid's first airgun when I was a youngster. They had them in the late 60's. This one looks 70's. Don't know how long they made them. Too long? I think they shoot pellets single shot. Apparently some guys relive their childhood by getting one again. Thanks, Dad for not getting one for me. LOL! My friend WAS proud of his. 
 
I got one for Xmas when I was about ten. Cheap, weird, funky, bad trigger action, weak-shooting, inaccurate and... worked fine for quick-draw contests against my Big Brother armed with a comparably cheap, weird, funky, bad trigger action, weak-shooting, inaccurate Daisy 179 'Spittin Image'.

Backyard distances, strict rule of no shots above the waist went often compromised in the heat of battle when SPEED was the top priority. Both "guns" stung like a bee with any hit; but the most debilitating hit I witnessed was when my buddy hit Big Brother with a nipple shot! Kim danced around for five minutes spewing profanity no-one would imagine in a twelve year-old vernacular, had One not witnessed it myself.

Proof positive it doesn't always take impressive equipment to have great fun; especially when mixed with great imagination(s)! 


 
I had one of the Marksman pistols at 7 years old so definitely available in the late 60's. Possibly some year variation on model numbers but the Marksman platform was available late 60's.

Had to have a BB removed from my triceps in that same time frame-accidentally shot by a cousin at very close range. Entered back of the muscle and moved a couple of inches forward just under the skin. Small incision to remove. Even low powered BB's or pellets can penetrate bare skin if close enough.