Air Arms Dating an Air Arms Pro Sport

Could someone tell me how I can date my Pro Sport ? Serial # 131078. I don't know how to determine that. Just trying to establish age of rifle. Thanks.
Wait, we need pictures Man. Pictures!
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went past a ranch once and the sheep had different color spray paint large dot on their backs , Some kind of code ?
The sheep has paint on it's back to show the shepherd that there is something special about this particular sheep that needs to be easily identified while standing at a distance. It could be that she has a mark because she's his favorite 😉😉

( I ad-libbed the last sentence)🤤
 
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