It looks like the Metal work is an original TS, with Barrel machined stops for the original
"End Locking" Bayonet (Cross Lug and Byt slot).

Very Early ( 1897- about 1900s early) TS had One or Two cross Bolts, until the wood Inletting was re-configured to eliminate the Bolts...occasionally a Wrist Cross-Bolt was added "in the field" if the stock was beginning to crack (during WW I).

The rifle Wood seems to have been converted during WW I from a simple "Musketoon" ( underneath sling swivels) to a Combined Musketoon-Carbine ( side-slings attachments added ( ie, new Barrel sling band), and exchanging the original cross lug, Jug shaped Stock cap with a normal M91 Rifle Bayo. Band ( like the eventual M91/28 Model.).

BTW, the 91 TS was only produced from 1897; the Cav. Carbine 1893, and the Long Rifle 1892. All are classed "Mod.91" ( date of official adoption of Design).

The Number of WW I variants of the TS are mindboggling, as many "conversions" of the Musketoon style to a "Universal" style were carried out by Field Depots and Individual Unit Armourers. So much so that the final "model" only came about in 1928.

Doc AV