They look very much like Mexican silver inlaid spurs to me. A friend of my dad brought me a pair that look similar in the 1930s - considered extra fancy since both outside and inside surfaces are silver inlaid - Mexican labor and silver were really dirt cheap in those depression years - though, by standards of the era - probably fairly expensive.
There's a story behind their having been used (and they do show obvious use) - having to do with this young 12 year old cowboy "stealing" (he thought) a 7 year old gelding at local auction for $15 - well under average of $45 then - only to find out his previous owner was intimidated by him and he was really spoiled. I admit to being embarrassed when nobody bid against me - which told me everybody there knew something about that horse I didn't - and I soon found out what that was.
Now, 12 year old cowboys aren't smart enough to be intimidated - took me some time to shape him up - one day I got fed up with his not working right cutting cows out of a herd - decided right then we would establish who was really the boss in charge - those spurs convinced him with only slight touches.
Ranchers paid $5 per day to work cattle using the rancher's horse but the price went up to $8 per day if the cowboy rode his own horse - so I paid for him the first five days I worked him. We moved to the city four years later and I thought I'd make money since everybody had seen me working cattle with him and doing a good job - didn't happen - evidently they all concluded he was a "one man horse" who would only produce for me. Did get my $15 back selling him and $45 for my saddle, bridle, and tack.
The current issue of Western Horseman magazine has a pair of spurs sent in for value estimate - just plain steel - nice but - no silver inlay - estimated value - would you believe - $7,000!!! I would think our spurs would double or triple that.
You might want to contact that magazine for appraisal of yours - they look essentially unused to me.