Things are too quiet. Try this one. I don't think this will be easy. I've spent a good bit of time looking.
Maybe Kushan Empire, Vasudeva I? What's the size and weight? Yours (edited for ease of viewing): Reduced weight tetradrachms from Vcoins, CoinIndia. There are some similarities. Another like the above: Description of the above two coins: INDIA, KUSHAN: VASUDEVA I AE REDUCED WEIGHT TETRADRACHM, WITH ADDITIONAL "DELTA" SYMBOL. RARE AND CHOICE! Obverse King standing facing, sacrificing at altar at left, symbol under arm: "delta plus comb" Reverse Oesho (Siva) standing facing, holding trident and diadem, Bull Nandi behind Date c. 191-226 CE Weight 6.73 gm. Diameter 18-20 mm. Die axis 12 o'clock Reference Göbl 1008, MAC --- (unlisted) Comments This rare type has an unusual symbol under the king's arm that has been called 'delta plus "comb."' Maybe @THCoins will see this and weigh in. It looks like a coin he could readily identify.
TIF, size 17.7-17.9 m/m. sorry, no scale. Thickness norm=2 m/m, but on the bull's ass, 2.51 m/m. That hip is a knob. sorry about the need to correct thickness
The source design of this one is indeed the Standing king/Shiva with bull issue of Kushan Vasudeva. However, this design was used for several hunderdes of years for local coin production in post-Kushan times. In view of the crudenes of the execution this is one of those post-Kushan copies (not a counterfeit, these were used in trade). A worn early lifetime Vasudeva copper would look more like this:
Thanks much THC, I see the evenness of relief on this coin,which is what I expect on this age of coin, while on mine that hip knob is almost the 1st. thing a person notes. Who ever made mine had a really big hammer to get that hip to form. I have seen that hip on a couple of net coins after John and TIF pointed me that way. Bet they are after market also.
They may be crude, but users were confronted every time they handled these with the authority of both the ruler and Shiva. This is another of the Kushan designs you may encounter is various stages of abstraction from post-Kushan times: On the left again the standing king. On the right the seated goddess Ardochsho with wreath and horn of plenty.