Jose, I would place Bayard/Pieper as Brand Value four (BV4) as they are a known Continental brand, but a brand not generally highly reguarded by the market. The gun in the photo looks to be between a best work BLE (OQ5) and a second grade BLE (OQ6). That would make it Original Quality grade OQ5 or OQ6. The condition sounds like "Shootable but needs repairs or restoration" to "Marginally shootable, significent repairs required soon". That would make the Current Conditiion level at CC7 or CC8. So, BV4-OQ5-CC7 = $466, BV4-OQ5-CC8 = $292, BV4-OQ6-CC7 = $344, and BV4-OQ6-CC8 = $215. James is certainly in the envelope in his estimate. If it is sound to shoot, that moves the value up toward the top of the range, as James states.
Hope that helps some.