Never saw one of those, but I have seen 3-group Astoria's made by CMA. I didn't like its group - too complex and had only passive heat control.
But the one I looked at was built like a tank (typical of CMA products - BTW: isn't your lever machine made by them?) and I wouldn't have minded using it. A 1-group like that in decent used condition should sell for $300 - $1000, more if the seller isn't all that motivated. Is it a plumbed or pour over machine; vibe pump or rotary? Accessories: portafilters, filter baskets. Condition: paint, chrome, rust. Everything contributes to value or detracts from it.
Wish I could be more helpful, but there are just too many variables.