Is this M. guerreronis??

It is a reasonably old plant, about 25cm tall, and looks ot me to be guerreronis. Here are some photos and I'd be interested in comments:

First the whole plant



and the top part, showing the rather brownish red flowers:



and a closer look at the top, showing some opf the randomly present hooked spines

Yes, you got a "real" guerreronis there. Not the easiest to flower in our part of the world.
The flowers convinced me. They open not wide , the position of the flowers, and as far as I know there's only one Mamm with this shade of brownish red flowers : guerreronis. Nice bargain, you lucky....

Thanks Hugo, nice to have confirmation. It's not the tidiest of plants, as you can clearly see several growth stages on the stem, but I'm glad to have found it. There is quite a difference between this plant and my very much smaller plant that bears the L1096 attribution, that I posted about a while back. That one is from (if the plant is correctly labelled) Mezcala, on the Rio Balsas in Guerrero, so the location for it is right.