You have a 18.5 inch barrel Texan. I overlooked it. They only made the 18.5 for 3 years. That's a rare one.
"MODEL 336T (TEXAN)
.30-30 Win., .35 Rem., or .44 Mag. (1965-1967 only) cal., similar to 336C, with straight stock. Some models have a 18 1/2 barrel (1980 - 1983) or 20 in. barrel, saddle ring (1965-1971 only). Mfg. 1954-83."
