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You want commercial mortar WITH cement.
If you are tuckpointing soft brick from that era, you want soft mortar. Mortar must be softer than what you tuckpoint.
For stone, which is ROCK hard, you are ok with commercial grade mortar.
Not a mason, but own tons of buildings from that era.
Loosen up any old mortar, one section at a time, then powerwash between the stones. Then, get a squeeze bag, and shoot it between the stones as deep as you can...
Good luck.
Bo
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