I am trying to identify this bike.
It has a club cutout in lugs and 4 card suits on inside of fork crown. Frame's serial number is 75390.
Also has direct frame mount above rim mafac Brake bosses. Takes a 27.2mm seat post.
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The frame looks like a Mercian Strada Speciale based on the clover leaf cut outs in the lugs.
At the Mercian website there is a collection of catalogs you can use to compare your bike to the manufacturer's specifications
The fork is confusing. I can't find a Mercian with a fork crown EDIT: tang - the inside of the fork crown with the spade, club, heart and diamond - like yours.
Usually a manufacturer will make the frame and fork the same for a specific model of bike for a whole year or several years if the economics are working for that model. I couldn't find a year, catalog, that has that fork on that model.
Maybe the fork is from a different bike?
As JoeK below says bicycle lug makers back in the day made these parts for frame and fork makers to use. The long tang on the inside of the fork is actually a sperate part, not attached to the crown, that is brazed or silver soldered on to the fork.
I did find a Serotta fork crown that was similar:
Though the fork crown pictured has the spade, club, heart and diamond but it also has a stylized "S" on the top of the crown.
This Saba Equipe frame has the cutouts,
but has their brand logo on the top of the crown
More photos might be helpful, but the club motif is strongly identified with Colnago. Apparently Colnago was pretty spotty about serial numbers for a long time. Here's some info
Downtube shifter bosses suggest an 80s bike, or an earlier 90s frame.
The handlebars are untaped and what I can see looks like galvinised steel, which leans toward 80s.
All I can say is a lugged steel frame from the 80s. Please add a full photo from the bike's right-hand side.
Aside - your shiny new brake pads are for Alloy rims - are your rims aluminium or steel ?