When I first saw it, I thought low "C" prefix gun. But the one line ahead of the sideplate suggests it could be an SV prefix (early postwar commercial made up from leftover Victory frames) or even a pre-war (no prefix). If the latter is the case, then either the stocks are pre-war magna (not common) or post-war ones substituted later on (not uncommon with a "cop" gun). Inquiring minds want to know....