New Brooks Instruments Flow Meters, 1/2" NPT Ports, 200 PSI at 200F, Part Number S-925-J-207-AAA or 1305D08A1A1A; National Stock Number 6680-01-148-4680 or 6680011484680.  Each bid quantity is for One (1) Flow Meter.  You may bid / buy any number, up to the total quantity available above.

These were purchased at the liquidation of an industrial semiconductor plant a while back, and they appear to be new / old stock in the original plastic bags.  They are from the company's spare parts inventory, with minor shelf wear, as would be expected.

According to the NSN:

Specifications

Construction: Side plate     
Float Quantity: 1 
Float Material: Steel, Stainless
Float Type: Free
Design Type: Case
Media For Which Designed: Any acceptable
Meter Type: Float
Metering Tube Quantity: 1
Mounting Method: Direct line
Outlet Connection Position For Which Designed: Vertical
Outlet Connection Size: 0.500 in. NPT
Outlet Connection Type: Threaded
Inlet Connection Position For Which Designed: Vertical
Inlet Connection Size: 0.500 in. NPT
Inlet Connection Type: Threaded
Scale Quantity: 1
Scale Type: Direct capacity reading
Special Features: Brass end fittings
Tube Material: Glass, Borosilicate
Unit Type: Mounted
Federal Supply Class (FSC): Liquid And Gas Flow Liquid Level And Mechanical Motion Measuring Instruments  
National Stock Number (NSN): 6680-01-148-4680