That would have been ideal for conversion to the 7.92x63 swede that was so plentiful a few years back for super cheap. However, these days it has pretty much all ended up in permanent homes.
Is the barrel chrome lined? Makes a big difference wrt suitability for re-chambering.
His barrel is in 7mm, not 8mm which be fine for the 7.92x63 conversion.
There were lots of browning 1919s converted to just about every standard dimension cartridge used by most militaries.
I've seen them in 7x57(Brazil), 8x57(Africa), 30-06, 303Brit, 7,62x54R, 7.62x51 as well as others.
This shouldn't come as a surprise. There is a whole big world outside of North America and when they see something that is almost bulletproof under battlefield or even just field conditions, they buy it, copy it or adapt it to their purposes.
Nice barrel to use as the basis of a heavy bench rest rifle. Especially if the bore is consistent and of acceptable diameter. Many machine gun barrels, tend to be slightly oversize. Back in the day, when they could be had for under $10, we would buy them up 50 at a time. Slug all of their bores and save the perfect to standard bores for BR builds. The others were usually acceptable for recontouring to sporter dimensions. Lots of work, lots of fun and the barrels we used on the BR rifles were close to being free after all was said and done.