Hi tbird914
I did some more searching on the internet and found a similar knife being discussed and the poster claims that the brand MCA MH RDA is in fact an abreviation of `MARCA MARTINEZ HERMANOS REGISTRADA', and he dates it to the 1960s. See
https://www.facebook.com/groups/6417.../?locale=es_LA
Further searches revealed another knife with the word `Solingen' under the same brand and the owner claims it to be quite old. In all probability, the blades with `Solingen' were purchased from Germany and mounted with furnishings in Uruguay by local craftsmen and perhaps later renditions were made with blades made elsewhere . See
https://www.instagram.com/p/CXKMADfpesC/?img_index=1
Also searched for Martinez Hermanos in Uruguay and found a post in a forum in which it is claimed that the firm was a well known Montevideo jewellery shop that sold these knives with blades obtained from Solingen, and that these knives are considered over there as of average quality. See the last post
https://www.fullaventura.com/foro/viewtopic.php?t=71907
Cheers
Chris