Need help with value of 1948 Royal Typewriter, KMM model

Trying to get a sense of what this typewriter might be worth. Condition is good, but it needs a new ribbon. Have original manual and purchase receipt from Royal Typewriter Co. dating this particular unit to March 5, 1948. As a matter of interest, it was purchased on March 10, 1948 for cash in the amount of $169.23, which when adjusted to today's dollars is $1,675.71.

Any feedback would be appreciated.