By length and shape it seems to replicate a second year smelt.
It has a treble hook that will create more hookups during the period of cold water with slightly warmer surface water, when fish are slightly more lethargic and prefer something moving a little bit slower.
Its’ nose appears to be flat or slightly turned up and tuned with a slightly larger treble hook (for its width), it should have excellent action at slower speeds (again taking advantage of the slightly warmer surface waters).
Based on the conclusion from above you would be best served to match the use of this spoon in your pattern with spoons of similar characteristics or those stick baits which are excellent at slower speeds. The point that I’m trying to make, is that your pattern will be maximized, when all of your baits are working in harmony. You can tune most lures to run at various speeds to give you different actions at the same speeds.
With a few plastic boxes, and time on the water, you can begin to create your own patterns using your own selection of Lures that will produce most effectively running at the same speed. Depending on how accurately you can measure the speed of your lure at the ball, I would recommend a minimum of three or four boxes and therefore three or four speeds that you can choose lures as the day requires.
Depending on your budget and/or tape, nail polish, or spray paint, you can change colors to determine that days’ preference. Lures with different actions than other lures used in your pattern at the same speed, will drastically reduce the overall effectiveness of your pattern.
The above is my opinion and I encourage an open and honest discussion that will improve anglers’ success without disclosing “hotspots”. / Jim