Toll Free 1.866.888.7478

Stork Francis Orval Series One Piece French Horn Mouthpiece

Francis Orval

These mouthpieces are wildly popular throughout Europe and Asia as well as here in the states. They offer a perfect blend of cup depth and shape, along with a very moderate bore size that combine to give this mouthpiece exceptional play-ability and adaptability. This mouthpiece has its place in major orchestras throughout the world as well as in the hands of solo artists and chamber players. To find out more about Francis Orval, please click here.

Available in 9 different inner diameter sizes, finding one to fit your needs is easy to do!

Bore: All Orval models have a bore size of .183″ or 4.646 mm

Back bore: Medium with a straight taper

Inner diameter: changes by model - see models below

Cup shape: Medium deep, very bowl shaped


O4 (16.662mm ID)

O4 1/4 (16.865mm ID)

O4 1/2 (16.97mm ID) Closest to a 17mm feel

O4 3/4 (17.170mm ID)

O5 (17.348mm ID)

O5 1/4 (17.475mm ID) closest to a 17.5mm feel

O5 1/2 (17.729mm ID)

O5 3/4 (17.881mm ID)

O6 (17.957mm ID) closest to 18mm feel


Available in silver, gold plating, and silver cup with gold plated rim only. Plating is done by Stork Custom Mouthpieces in house.


Francis Orval mouthpieces are offered with standard American or European shanks.

Made proudly in the USA from Vermont.


Not all options are in stock. We plan to have the most popular items available for immediate sale, however many options will be special ordered, therefore, please allow for 3-4 weeks delivery of those items. If you have any questions or concerns about inventory and need something quickly, please call or email us so that we may accommodate your request.

$69.95 $98.00

Get Your Perfect Product

Siegfried's Call is proud to provide you with products optimized to suit your very personal tastes and musical requirements. As a result, many items we offer online are highly customizable and made to order according to your specifications.

Special Orders

After choosing your preferred item(s), please contact us for a supplier's delivery schedule, and then special order the item after we have confirmed the estimated shipping date.

Siegfried's Call will maintain communication with our suppliers and forward that information directly to you during the waiting period.