These are M1As in M150 chassis. 150WPC. I bought these directly from Keith in 2015- they were his personal amps and I was looking for a wider M150 sized amp so he sold them to me. The serial number is DC001 (my initials) so he can confirm that they are in fact M1As. They were upgraded in 2019 to "a newer lever", which was a $550 upgrade and was a really nice improvement. The amps are in great condition except the screws show some corrosion since we live near the ocean. Those screws are super cheap and super available for swapping.I've loved these amps and would keep them if I hadn't invested so much in a new SET amplifier. What's amazing about the M1As is how versatile they are, working with both inefficient and also high efficiency speakers. I had to spend a lot of money to get something better. I can include some homemade Duelund Power Cords (2') at no cost if interested. I will look this weekend but I may not have original boxes but the amps will be packed very carefully for shipping. $140 in USA
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