Question about Soundcraftsmen pm1600

I found my way to this forum after extensively searching and finding next to nothing about my Soundcraftsmen PM1600 power amp, or any of the old gear I pulled out of a garbage can ten years ago. It's been good to me over the years, but I'm in a position where I need to sell it and have no clue what something like this is worth. I'd also be interested in any history/info I could find out about it. Thanks for the help!