US 386?

I have very little familiarity with pre-1920 US classics (most of my US are post WW1) but have recently acquired several older coils so I would like someone to confirm that the below stamp is in fact #386. It has 12 perfs horizontally and to me it looks like the fairly valuable #386. Whoever had the stamp before me wrote on the card that it was #386.
Regards
Mike

Mike, First thing is to verify the matermark. The 386 is single line (wmk190) and the 349 is double line (wmk191). The perforation is 12-66.25 or analog 11.9.

It could be the 349 or the 386 it depends on the watermark if it's double line 349 or single line 386

Dam... Replied to whilst typing and checking no's

Russ and Razersedge, sorry I forgot to mention watermark. Unfortunately, I can't tell if there is a single or double letter watermark. I put watermark detection fluid on the stamp several times but because of the heavy cancel, I can't seem to make out a watermark.
The first scan below is the back of the stamp without watermark fluid while the second is with fluid.

I see what you mean it is very hard to see which usually points towards the single line try turning the pic in to a negative to see if becomes visible about 2/3rds up on the right side on the edge looks like the base of a "P" double line but if it is then the water mark is diagonal which can't be right it must be an illusion from the cancel

Razersedge, thanks for your suggestion. I have Photoshop Elements 9 so I took the scan of the back which has watermark fluid and edited it to apply the Invert filter. The Invert filter inverts the colors in an image. You might use this command to make a positive black and white image negative or to make a positive from a scanned black and white negative.
Here is the new scan but I still can't see the watermark:

My opinion is its a 349 double line top left of the stamp there are 2 vertical lines the "p" and the some of the baseline halfway down the stamp, and there is no cancel on that part of the stamp but I can't see the loop of the p, so it could be a inverted "u" or a "u" depending on how you turned the stamp but I would say it's 349

Is not that a loop in the lower left corner. It looks like the loop of the "P". (single line) See the image where both with and without watermark fluid is shown and not the images which have been manipulated. From the face there is no cancellation ink in that corner, so you are not seeing the cancellation from the back.

Your right there is the top of the p in the bottom left but still looks like a double line to me you can see a inner and a outter line on the p loop and the p stem has a flair out at the top on the side of the stamp

I suppose it is open to interpretation. Not sure I can convince myself I can see what you refer to.

sure looks like a double line to me, but the looks like is very very faint!

When I get home I'll highlight what I can see ( or think I can see ) it like one of those magic eye pictures from the 90s if you stare at it long enough it comes to life lol

To all who what tried to find the watermark - many thanks.

Razersedge, if you can further manipulate the image to see the watermark, I hope you can give me the confirmation I seek.

Regards
Mike

I've been trying to show it up better but the scan is to low quality and keeps pixelating I've resorted to downloading a newer version but I have picked up a trojan at some point and macaffie can't delete it and my computer keeps shutting down so I'm running it in safe mode and scanning it at the moment to get rid if it but if you can do a better scan with the fluid it would help

Razersedge, sorry to hear that you picked up a virus. Hopefully your scan will eliminate same.

Below is another scan of the back of the stamp with watermark fluid at 600dpi and resized to get under 100k. Hopefully it will suit your needs.
Regards
Mike