My first words were, "f#ck is that ever rough". Let's look at the sum of the parts:
- VERY scratchy casting, but slightly more finished on the left sidewall
- marked as a Mark I/2 conversion
- 1st type button cocking piece, so that part is early wartime or prewar
- British Mk I style bolt latch so it could not be a Savage Mk I*, except if this is a first production run Savage before the asterix variation was approved
- huge "US" stamped on receiver ring, but not in the usual place as a Savage "US PROPERTY" marking
- light coloured beechwood stock, which would be appropriate for a British postwar FTR rebuild
- the crosspin is an Indian affectation mentioned in the British manuals, meaning the stock could have been issued in India and travelled the world before landing in Canada
- Philips head screw on stock, which to me screams home gunsmithing project
- traces of Suncorite finish
I would ignore the markings on the detachable parts. They came out of a bin and could be any maker or age, as long as they were serviceable. To my eye and references, you have an early Savage No.4 Mk I that has a non-standard "US" marking for Lend Lease purposes, and which was rebuilt postwar to the MkI/2 standard, and has since been experimented with or repaired in recent years. The shame of it is the original Savage markings are now gone, so it has curiosity value and shooting value, but exceptionally limited collecting value.