Bill:
To the best of my knowledge, if your scopes are made from steel, it's a sure bet they are of the old "T" series and were made in El Paso. Your T-25 was more than likely also made in El Paso.
The newer "T" series are produced by Meade Instruments, are made from aluminum and have better (brighter and sharper) optics, but they do not have the original "Microtrac" windage & elevation adjustments. The adjustments on the "new" Weavers are in 1/8" increments, whereas the older, El Paso-made scopes have 1/4" adjustments. I cannot say if the new adjustments are as reliable as those on the older models. :cb2: