From the 1970s.
Hi-Standard will not be able to help you with parts or service if needed.
DW may not have parts, if needed, for that one.
The one a friend was trying to trade me had a sticky trigger return.
Unless you're absolutely head-over-heels in love with it, I'd pass.
DW's from that era were known to be accurate, but COULD be finicky as far as reliability goes.
Most were good, some were not.
DWs were popular among metallic silhouette shooters, but were not widely carried by police. A gal who went through my state's police academy with me in 1980 couldn't keep hers running through the shooting segments.
Not saying ALL were bad, you may get some other responses with positive comments.
Plan B would be to offer $300 & see what happens, if you have to have it.
Denis