I do have 5 kopeks copper coin(expect to be Catherine I or Peter II) from the year 1727. (Naberezhnye Moskova)

I'm not sure if this is irregular coin, since it should have year number 1727, but it has 727. (It's in good shape. It looks like the number 1 infront of the 727 has not
lapsed away.)

Is there any way to make sure that this coin is not fake? I have kept this coin already 20 years. What would be the value for this coin.

Picture of the coin is attached here. I would appreciate if some specialist would take a look of it. Thank you.

I'd guess that the 1 is there, just weakly struck or damaged (it looks like there's some dent on the coin where 1 was). I do not believe it is fake, nor that it is particularly scarce. As far as estimating prices, I'm pretty bad at that - so my guess is 30 to 40 US.

Thanks for the estimate.

I found similar coins from the web which is for sale with 260$ USD.

http://www.odinscastle.biz/ZenCart/index.p...&cPath=2_83

Check the attachment. It has different kind of bird in the picture. How is this possible?

That one is KD mintmark, yours has ND so it is not the same. I can't tell what's going on the picture on that website, it maybe a scarce variant, but most likely a bit overpriced. As far as different eagles there are dozens of variations, possibly lots more than dozens. I'd guess they made a few million of 5 kop coins with 1727. Many were later overstruck into 1755 kopeek, some into Elisabeth's 2 kopeeks, and still we see them quite frequently. I would not be able to say how many dies were cut, to strike so many in the span of probably 2 or 3 years.

As far as the price goes it is just my guess, based on what I've seen on eBay. Certainly prices change very quickly these days, and I do not have a professional interest to keep up.

BTW, yours maybe a KD, I find it hard to tell from the picture.

The mintmark of your coin appears to be "НД" to me (not "КД"). There are at least six different eagle varieties for this variety according to Brekke. I believe it is Brekke 25, one of the more common varieties, because the circle around the eagle is a line and not a series of dots. However, it is hard to tell just by looking at pictures. As to the "missing 1" in the date, this is probably the result of a weak strike or else a filled die. Maybe Bitkin (or other references) will have more varieties, but I cannot easily consult that reference at the moment. I am sure that others will have more to say about this one. Of course, I am no expert, and this is just my own opinion.

As to price, the 1987 Brekke supplement lists US-$40 (at that time for coins in VF condition), so today it might be worth as much as $100 ... probably not more, however.

No, his is most likely ND (IMHO) ... KD is quite rare according to Brekke.

This is another 1727 5 kopek that I have but you can tell that it's a different variety:

Probably ND, I thought I saw some curves at the edges of the right part of H. Bitkin lists 13 variations of the 1727 ND. I'm sure there are more with subtle differences. His prices (from 2003) for VF are mostly 25 US. Conros 2007 price guide lists it as 35 US. And I've recently seen something like it on eBay go for something close to 40.

Here is better picture of the mintmark. I do have very lousy digital camera.

This is the best shot. I think it's ND.

This is a genuine HD mint coin of Catherine I. The "1" in the date is missing due to a weak strike 9 o'clock. Notice the lines of the cruciform fades as well. I agree with the previous range of prices posted here... but you would have to sell it to confirm its value at auction. It is one of the most commonly seen dates and mintmarks for this type, but a nice coin for starting a collection!

Thanks for the enlarged detail ... your camera takes nice pictures, really!

I can see that the circle around the eagle is actually made up of dots now, so I think it is probably Brekke 24 and not 25. The prices given by Jim Elmen in the 1997 Brekke supplement are a little higher than the ones I quoted before:

(Catherine I:)
23 - $50
24 - $75
25 - $50

Nice coin, BTW!