Mend a blade?

[Pukka Bundook]

Purchased another old Tulwar.
It has a light, wide (1 5/8") blade with wide shallow double fullers.
There is a crack in the spine of the blade a couple of inches from the hilt.

Q. Is there a way to repair this?
Purchased for very little, as lower quillon is broken off.
I know we don't use these things anymore, but prefer sound condition!!
Will post pictures soon.
One other question;
We see tulwars with narrow-ish but thick blades, and others with broad, flat springy blades, is there a general rule, that one type is older than the other, or were both styles in use together?

Please pardon my questions, But figure it is the best way to learn!!!

Thank you in advance,
Richard.