Amber coating on a flash bulb is a new one to me. They may have been once coated coat with clear plastic (to protect against a bursting glass envelope) and have yellowed with time to give you the current hue.
Don't disrespect the ag-1's. They pack as much light output as the M2's and M25's, just in a smaller package. They had multi-grip flash holders the could take M-25, m-2, m-3 as well as the little ag-1's. There were also ag-1 specific flash holders, that usually had a 2" reflector.