Interesting.

That receiver was made between 1924 - 1926, as ' Made in Austria ' first appeared on the MS in 1924 and ' Oesterr, Waffenfabrik, Ges-Steyr ' changed to ' Steyr Werke AG ' in 1926.

My guess would be that an owner just didn't care for the 'butterknife' and had it converted. Then again, could it have been ordered that way? Steyr was known to be accommodating on custom orders of MS.

As 'wrong' as that big arsed ball looks on a proper MS, it would be easy to grab and cycle even with a gloved hand. An exercise in function over aesthetics?

It appears to be an otherwise very nice little M1910 takedown with honest looking wear. All it needs is a set of cleaning rods, a spare M1910 bolt, and a fitted case to hold the whole bit of kit.