Used MarkII 6.75 SS worth???

[3leggeddog]

Hello,I paid 360.00 for a very nice little used Ruger Mark II Competition Model Slabside SS with a 6.75 in barrel. It came with the orginal box ,2 mags, the scope rings + a mount and the manual. Did I pay too much????

Can someone tell me how old it is : Catalog # KMK678GC model 00186

Ser# 224-26xxx

Thanks for you time…