For such a narrrow crack, getting enough epoxy into the space to restore structural strength will be tricky. I’ve had good success with fine sawdust ‘petrified’ in place with cyanoacrylate (CA) glue. Practice on a test piece to optimize colour. A museum conservator would probably not disguise the repair, but if you are trying to do that, consider refinishing the whole piece. Changing moisture conditions, as already pointed out, will stress any repair but given the piece’s age, maintaining humidity within normal indoor conditions will minimize any movement.
For such a narrrow crack, getting enough epoxy into the space to restore structural strength will be tricky. I’ve had good success with fine sawdust ‘petrified’ in place with cyanoacrylate (CA) glue. Practice on a test piece to optimize colour. A museum conservator would probably not disguise the repair, but if you are trying to do that, consider refinishing the whole piece. Changing moisture conditions, as already pointed out, will stress any repair but given the piece’s age, maintaining humidity within normal indoor conditions will minimize any movement.