Don't know Lyman number but Brownell's catalog shows a part number of 539-057-003 and a "Model number" (possibly the Lyman number?) of 57WJS for the Mod. 70.
Yup.
The 48 was Lyman's deluxe sight, the 57 was less expensive. Still with the same suffix for M70, 48WJS or 57WJS. The 48 is long discontinued but can be found; lots of them taken off and replaced with scopes.
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