No4 with round bolt knob. Is this typical?

I found this bolt in my spares with a completely round knob.
I’ve only noticed either hollow bolt knobs or solid ones with a flat bottom on No.4’s.

Just curious if this is typical?

Thanks in advance!

https://imgur.com/a/QL9SmgF

The MK2 has a round (spherical) Bolt knob.

Inviato dal mio 2201117SY utilizzando Tapatalk

As well as Mk.2 rifles you'll see it on bolts replaced in post-war refurbishments as well as bolts made in Belgium post-WWII.

Ok so it’s post war, I was hoping it was early.

thanks guys!