First of all, I have two comments regarding your proposition:
1. many bows of that era (including Bear) were not exactly as marked with more of them being a pound or two..or MORE, than marked.
2. with the introduction of fiberglass in the early 50's, it us unlikely bows will lose weight over the years, even when left strung over long periods of time.
If all are 45# on a scale, the results would be interesting considering how the different limb designs affect velocity.