You have not asked a question. You have stated what you have.
1950's
Sako L61R ser num: 1 to 90954 Manufacturing date between January 31st, 1962 and September 12th, 1973
No known US data published.
Someone at sakocollectors.lefora.com might be able to help
These rifles made in Finland
Depending on condition 400-1000
SN 128273 was shipped in 74 and SN 152027 was shipped in 78. Best estimate would be it was made in the 77/78 time frame.
'ser' = to be
The cast of No ser o ser - 2011 includes: Paloma Santos as herself
"ser" means "to be"
Quiero ser tu hombre Tu hombre quiero ser Hombre tuyo quiero ser
Quite possibly you mean the nosotros form of ser. The other way doesn't work because there is no ser form of nosotros. The nosotros form of ser is somos.