Hi Steve, welcome to the board, it's good to see you here. May I offer my sympathy on your bereavement too.
According to this site
http://www.geocities.com/rodeodrive/6544/ where I was yesterday in search of info on Alboth and Kaiser, the Kaiser mark dates pieces from 1970 onwards. I'm sure others will be able to add more but the link above should help you date the Kaiser pieces at least.
Valuations are, as ever, always subjective and dependent on the market place - if you need an absolute verified value you may need to consider approaching a specialist appraiser, who would not only have the experience but also be insured to be able to value for you. Any valuation given on the board here would only be the opinion of that person, I hope that's acceptable for you. Feel free to ask as much as you like though, we'll do our best to help.