This is a used / Vintage WIKA pressure gauge. 

• It is likely a liquid-filled gauge, possibly with glycerin, which helps dampen vibration and lubricate internal components. 
• The measurement range is from 0 to 2000 psi (pounds per square inch). 
• It has a lower connection mount with a 1/4" NPT thread. 
• The gauge is manufactured by WIKA and marked "Germany"