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Some sight information:

101901

It could be an illusion, but, the area that I have framed in red seems to have a different shade to it. This could be suggestive of removed part of bayonet-bar.

101900

There are Rolling-Block barrel-bands that 'screw-clamp' and ones that are retained by a band-spring. The Danish band on your .43 cal. Rolling-Block is an incorrect replacement.

It appears your...

The barrel-bands marked with a "U" are Remington bands. The one with a Crown is for a Danish model 1867 Rolling-Block.