1832-1966. They were makers of all types of cutlery. The New York firm Wester Bros. imported goods manufactured by Wester&Butz. The trademark "Anchor, Star and Arrow" is the original trademark of Wester&Butz.
Yes, this is a good razor.
That straight razor was made in the 1950's to 1960's. That is certain. As to an exact year? Impossible to tell, they made the same style of razor for decades. It is known as a hollow ground razor also, and it is in good enough condition to shave with if you had it honed properly.