It was Samsung's second Android phone, the younger sibling of the original Samsung Galaxy GT-I7500. Back in 2009, it cost around 350-400 USD. I found this one on Vinted for just €20 + shipping, and it's running Android 2.1 Eclair.
The phone has Android 2.3.3 Gingerbread, it arrived well packaged and in excellent condition
Technical specifications (From GSMArena):
Screen: 3.5-inch TFT LCD
Resolution: 320 x 480 pixels (HVGA).
Dimensions: 112.4 x 59.9 x 11.5 mm.
Weight: 113 grams.
Processor: Qualcomm MSM7227 single-core 800 MHz.RAM: 278 MB.
Internal Storage: 158 MB (expandable via MicroSD up to 32 GB).
Battery: Removable 1350 mAh lithium-ion
Camera: 5 Megapixel with autofocus and LED flash
Network: 3G (HSDPA 7.2 Mbps).
Wi-Fi: 802.11 b/g/n.Bluetooth: Version 2.1
Location: Integrated GPS.