Please see the attached pics. Is this an HRA trigger guard? I seem to recall seeing a reference picture that said something to the effect that the small bumps highlighted in the attached pictures indicate a trigger guard manufactured by Springfield Armory. But I cannot find the reference photos, so cannot confirm it.
Does anyone remember and/or have that photo? Does anyone have other or additional data on how to identify post-war trigger guards by manufacturer? Cross-posted on CMP.