Wow, great looking low mileage Mach.
I noticed it has a front spoiler. Do you know if it was delivered to Finland with it? I bought my 73 Mach 1 in January of 1978 and it had both the front and rear spoilers. The 73 body assembly manual shows it as standard (not RPO (regular production option) like some options) on Mach 1s, but no other 73 Ford literature I have seen mentions a front spoiler at all.
I know 71 Boss 351s had it as standard and the spoilers could be bought from a Ford Dealers parts department and fit al 71-73 Mustangs. When I bought a replacement from a Ford Dealer for mine back in the 1980s, it was only available in black. I painted it the original Argent (silver) color to be correct for my cars color scheme.