help to identify my Enfield

From your post.

It was made in 1917 in the reign of King George the Vth. Possibly by Birmingham Small Arms (because of the "ShtLE" identifier which was BSA's way of saying "SMLE", no matter, they are the exact same design.

Its a Short Magazine Lee Enfield (SMLE), also known a "Rifle No1 MkIII *", a simplified update to the earlier No1 MkIII (no star). No mater all these names indicate the exact same rifle.

It was made for military use, not civilian sale (the "crown" (Royal Cypher)) tells us this.

"I 7300" is the serial number & should be found on the receiver, barrel, under the rear sight, bolt, nosecap bayonet boss & under the forend, possibly on the bottom of the magazine also, but maybe not, not all were numbered. Matching numbers matters because little hand fittings were done to make it good & safe & the numbers track this. The prefix letter denotes the "lot" made, the number rotated from nothing through "A" to "Z" & then "AA", "AB" & so on.

Stamps to look for:

Crown NP, or Crown BNP, Civillian proof tests, may also have "2.222" & 18 1/2 ton (a square). Pressure proofs for civilian purposes. Not use or required my military, & so indicate a sale to the commercial market. A "Star" (actually 2 facing & touching "Broad Arrows" (birds feet)) denote removed from military rolls. These are fairly large. A small asterix on the breech indicates something else, as does thew one after the Mark & model information. Also look for an "FTR" stamp, these indicate a factory rebuild at some point in its life. Not a concern rifles were routinely overhauled, upgrade to the current model & refurbished.

There will be many, many small stamps everywhere. These are inspectors check stamps & many of them checked many things, bit they & the items checking or gauging are mostly lost to history. Its military history is harder, they weren't really checked IN & OUT that much, so much of it is also missing. Some had a brass d**k about the size of a nickel inletted with a unit code, but yours seems to gave been removed or never inlettt. Again no biggie many were as it gave away information if they were captured.

If it’s an unissued rifle in excellent condition, it would be worth north of $1200 USD.  Probably not many Savage Mk I rifles still around, the Mk I* with the simplified bolt release and 2 groove barrel was introduced shortly after the start of production in 1942 with serial numbers in the 7C8xxx range. 

It would be better to start your own thread on this rather than adding on to an existing thread about someone else’s rifle.