NL sent us this photo he took of Swiss Army MG51 machine guns and MG64 machine guns waiting to be cleaned.
The MG51, or 7.5 mm Maschinengewehr 1951, is the Swiss version of the MG42 manufactured by W&F. It is chambered in 7.5x55mm Swiss. It has been in service for over 60 years. The MG 64 is the Swiss Army designation for the Browning M2. There is not much online about the MG 64. Presumably the Swiss adopted the M2 in 1964.